class MyAesCrypt
	@cipher = ""

	def initialize
		@cipher = OpenSSL::Cipher::Cipher.new(ENV["CIPHER_TYPE"])		
	end

	def export_key(passphrase)
		# We want a 256 bit key symetric key based on passphrase
		digest = Digest::SHA256.new
		key = digest.update(passphrase)
		key = digest.digest 
		ENV['AES_KEY']  = cipher_key = key # stores the key in key, and also sets the generated key on the @cipher
		ENV['AES_IV']  = cipher_iv = @cipher.random_iv # stores the iv in iv, and also sets the generated iv on the @cipher
		return cipher_key, cipher_iv
	end

	private
	def encrypt(data)
		cipher.encrypt
		cipher.key = ENV["aes_key"]
		cipher.iv = ENV["aes_iv"]
		encrypted = cipher.update(data) + cipher.final
		encrypted = Base64.encode64(encrypted)
		return encrypted
	end

	def decrypt(data) 
		cipher.decrypt
		cipher.key = ENV["aes_key"]
		cipher.iv = ENV["aes_iv"]

		# Start the decryption
		decoded = Base64.decode64(data)
		decrypted = cipher.update(decoded) + cipher.final
		return decrypted
	end
end